I am not a big fan of cetraben - it’s got paraffin in it, which some people with eczema (including me) find irritating. It think most prescription dry skin creams are pretty terrible, because they are cheap.
La Roche posay lipiker baume is really good if it’s very dry
O’Keffes body lotion (yellow pump bottle) is good and much cheaper
Lots of people like aveeno, but it’s not moisturising enough for me
leave 20 mins after applying your steroid to put the moisturiser on
and make sure you moisturise three times a day - this is vital
However I think you’re going to need to apply the steroid twice daily to get rid of it, and make sure it’s a strong enough steroid.
the trouble with applying it weekly is it’s not going to be getting rid of it, just dampening it down so it will leap up. On the body you often have to use steroids for a couple weeks after the eczema goes so it’s actually gone all the way through the skin layers, else it will just come back.
if you aren’t seeing a paediatric Dermatologist I would pay privately if you can. GPs aren’t good at Derm, they don’t get enough training, and the wait for an NHS Derm is very very long
someone mentions Vaseline above which is also paraffin - it’s good at locking moisture in but it’s not good at moisturising, so stick it on top of an actual moisturiser